Mercurial > prosody-modules
view mod_storage_multi/mod_storage_multi.lua @ 1513:4ef0a1a499fa
mod_proxy65_whitelist: Fix util.set use (thanks deoren)
author | Kim Alvefur <zash@zash.se> |
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date | Tue, 23 Sep 2014 22:41:53 +0200 |
parents | 8c4a2d85e8bf |
children |
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-- mod_storage_multi local storagemanager = require"core.storagemanager"; local backends = module:get_option_array(module.name); -- TODO better name? -- TODO migrate data "upwards" -- one → one successful write is success -- all → all backends must report success -- majority → majority of backends must report success local policy = module:get_option_string(module.name.."_policy", "all"); local keyval_store = {}; keyval_store.__index = keyval_store; function keyval_store:get(username) local backends = self.backends; local data, err; for i = 1, #backends do module:log("debug", "%s:%s:get(%q)", tostring(backends[i].get), backends[i]._store, username); data, err = backends[i]:get(username); if err then module:log("error", tostring(err)); elseif not data then module:log("debug", "No data returned"); else module:log("debug", "Data returned"); return data, err; end end end -- This is where it gets complicated function keyval_store:set(username, data) local backends = self.backends; local ok, err, backend; local all, one, oks = true, false, 0; for i = 1, #backends do backend = backends[i]; module:log("debug", "%s:%s:set(%q)", tostring(backends[i].get), backends[i].store, username); ok, err = backend:set(username, data); if not ok then module:log("error", "Error in storage driver %s: %s", backend.name, tostring(err)); else oks = oks + 1; end one = one or ok; -- At least one successful write all = all and ok; -- All successful end if policy == "all" then return all, err elseif policy == "majority" then return oks > (#backends/2), err; end -- elseif policy == "one" then return one, err; end local stores = { keyval = keyval_store; } local driver = {}; function driver:open(store, typ) local store_mt = stores[typ or "keyval"]; if store_mt then local my_backends = {}; local driver, opened for i = 1, #backends do driver = storagemanager.load_driver(module.host, backends[i]); opened = driver:open(store, typ); my_backends[i] = assert(driver:open(store, typ)); my_backends[i]._store = store; end return setmetatable({ backends = my_backends }, store_mt); end return nil, "unsupported-store"; end module:provides("storage", driver);